Let-off mechanism for looms.



PATENTED OCT. 20

W. HAYNES. LET-OFF MECHANISM FOR LOOMS.

APPLlGATION FILED JUNE BZ, 1903.

NO MODEL.

UNITED STATES iatented October 20, 1903.

PATENT OFFICE.

WILLIAM HAYNES, OF ATLANTA, GEORGIA, ASSIGNOR TO DRAPER COM- PANY, OFHOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

LET-OFF MECHANISM FOR Looms. I

$PEGIFICATION' forming part of Letters Patent No. 741,661, dated October20, 1903.

Application filed June 22, 1903. Serial No. 162,656- (No model.)

To aZZ whom it may concern.-

Be it known that, I, WILLIAM HAYNES, a citizen of the United States, anda resident of Atlanta, county of Fulton, State of Georgia, have inventedan Improvement in Let- Off Mechanism for Looms, of which the followingdescription, in connection with the accompanying drawings, isaspecification, like letters on the drawings representing like parts.

This invention relates more particularly to let-E mechanism for looms;and it has for its object the production of simple mechanism comprisingfew parts to take up or compensate for unevenness in the tension of thewarp and to control the let-01f in accordance with material or excessivevariations of warp tension. I

In United States Patent No. 381,617 the whip roll or bar is so mountedthat it is movable toward and from the breast-beam, springs beingprovided to move it rearwardly against the tension of the warp, thespring yielding when the warp tension increases and expanding to take upslackness when the warp tension decreases. very even or uniform tensionon the warp is maintained during the weaving operation, and in mypresent invention .1 have with a simplification of construction andreduction of parts embodied all the advantageous features of thedescribed'apparatus in. connection with the so-called Roper let-off,suchas is shown in United States Patent No. 647,815, dated April 17,1900. In such form of let-off the effective stroke of the pawl whichcauses the positive rotation of the warp-beam is controlled by the warptension and by the diameter of the yarn mass on the beam; but the slightvariations in the warp tension which occur during weaving are notcompletely provided for.

The various novel features of my invention will be fully described inthe subjoined specification and particularly pointed out in thefollowing claims. 1

The drawing represents in left-hand side elevation a sufticient portionof a loom to be understood with one form of my invention embodiedtherein.

By this device a.

The loom-frame A, warp-beam B, having an attached gear B,thewhip-roll'W, mounted in rocking arms W, secured to a, rock-shaft Wmounted on the frame, the rocker-arm W fast on said rock-shaft,harnesses H, and lease-rods L may be of well-known or usualconstruction.

A rocking stud w pivotally mounted on the free end of arm W has extendedloosely through ita rod or link a, which passes loosely through aslotted abutment b on a bracket b secured to the loom side, and, as inPatent No. 647,815, the end of the rod extended through the abutment ispivotally connected at a with the member 0 of the compound pawl-carrierfulcrumed at c on the bracket b saidmember 0 being herein shown ashaving an ofiset for the stud a The other member 51 of the pawl-carrier,loosely mounted on the shaft B having fast on it a pinion (not shown) inmesh with the beam-gear B, the

"let-oft pawld mounted on the member (1,

and the let-off ratchet B with which it cooperates, may be and are allsubstantially as in the patent just referred to. So, too, the radius-barE, which carries the stud orconnection (not shown) between the members 0and d of the pawl-carrier, and the connected upturned arm E, whichgovernsthe position of said connection in accordance with the diameterof the yarn mass on the beam 13, are substantially as in said patent andoperate as therein described. Herein one end of a link (1 is connectedby a slot-and-pin connection 21 22 with the lay-sword A the other end ofthe link being pivotally connected with a depending arm d secured to thehub of the member 01 of the pawl-carrier, precisely as shown anddescribed insaid Patent No. 647,815, each forward beat of the lay movingsaid link in the direction of the arrow 5, imparting the feed-stroke tothe pawl (1*, the stroke always terminating at the same point. Thestarting-point of the stroke of the pawl, however, is variable, and itisgov- IOO lar or abutment a adjustably secured to the link by a set-screw12, the upper end of the collar being toothed, as at a). A second springS is coiled around the link between a sliding collar 10 on said link anda fixed collar or abutment (L22, secured by a set-screw 14, the end ofthe collar being toothed, as shown, to engage the toothed end a ofcollar a the expansion of spring S keeping the sliding collar againstthe rocking stud 10 As shown, the toothed ends of the collars areinclined or beveled, and when said collars are arranged so that theirtwo toothed'ends are parallel said ends will engage throughout theirentire extent. If one of said collars is turned, however, relatively toits fellow, the beveled ends thereof will be moved out of parallelism,separating the collars more or less just as if their opposed ends wereuntoothed. By making said ends toothed, however, a collar is held fromturning while its set-screw is being tightened, it being manifest thatto adjust either collar its set-screw must first be loosened. Thesprings are arranged in tandem and act successively and cumulatively, aswill appear more clearly hereinafter, the spring S taking the place ofand fulfilling the functions of the two springs e in the Durkin patent,No. 381,617, while the spring S corresponds in function to the springcorrespondingly lettered in Patent No. 647,815. The swinging movement ofthe rocker-arm W is due to variations in warp tension, and such movementis communicated to the member a of the pawlcarrier through both springs.In other words, the spring S must be compressed to a predetermineddegree before the link a will be moved longitudinally, and up to suchpoint of compression the said spring serves to take up or compensate forany unevenness in the tension of the warp. Thus the spring S operates tomaintain the general warp tension substantially uniform during theweaving operation. If, however, the tension of the warp becomesexcessive, the spring S will be compressed beyond the predetermineddegree referred to, and thereupon the spring S will be compressed, thelink a being moved longitudinally at such time, and the member 0 of thepawl-carrier will be moved to set the pawl d as in Patent No. 647,815,and govern the letoif accordingly. After this is accomplished thesprings expands to normal condition, and the additional spring S eitherremains compressed or it expands to raise the whip-roll in accordancewith the tightness or slackness of the warp. By loosening the set-screwof and adjusting either collar 0. or (L22 while the set-screw of theother collar remains tight either spring can be adjusted as to itstension independently of the other spring, and when the collars arejuxtaposed, as shown in the drawing, their toothed ends lock themtogether, it being manifest that so long as their toothed ends engage atall turning of either collar will be prevented when its set-screw iscollars interposed between it and the regular Spring S.

The construction is simple, effective, easily and quickly adjusted, andcomprises few parts.

The collars between the springs act as an abutment for the spring S, andI prefer to employ two collars in order that the tension of the springsmay be readily adjusted independently of each other.

Having fully described my invention,what Iclaim as new, and desire tosecure by Letters Patent, is

1. In let-0K mechanism for looms, a warpbeam, a ratchet, a cooperatingpawl, connections between the ratchet and the beam, to rotate the latterand let off the yarn, a rocking whip-roll, and a connection between itand the pawl, said connection including two springs adapted to actsuccessively, one of said springs taking up unevenness in the tension ofthe warp and the otherspring causing an increase in the stroke of thepawl when the warp tension is excessive.

2. In let-off mechanism for looms, a warpbeam, a ratchet, a cooperatingpawl, connections between the ratchet and the beam, to rotate the latterand let off the yarn, a rocking whip-roll, and a connection between itand the pawl, said connection including two springs arranged in tandemand adapted to act successively, one of said springs taking upunevenness in the tension of the warp and the other spring causing anincrease in the stroke of the pawl when the warp tension exceeds apredetermined resistance of the firstmentioned spring.

3. In let-off mechanism for looms, a warpbeam, a ratchet, a cooperatingpawl, connections between the ratchet and the beam, to rotate the latterand let off the yarn, a rocking whip-roll, and a connection between itand the pawl, said connection including two springs arranged in tandemand adapted to act successively, one of said springs taking upunevenness in the tension of the warp and the other spring causing anincrease in the stroke of the pawl when the warp tension exceeds apredetermined resistance of the firstmentioned spring, and means toadjust the tension of either spring independently of the other.

4. In let-off mechanism for looms, a Warpbeam, a ratchet, a cooperatingpawl, connections between the ratchet and the beam, to rotate the latterand let off the yarn, a pawlcarrier, a whip-roll, a rocking supporttherefor having an attached arm, a link slidably connected withthe armand pivoted to the pawl-carrier, a fixed abutment through which the linkpasses loosely, two springs arranged v in tandem on the link between thearm and said abutment, and an abutment fast on the link between thesprings, one of the latter acting to take up unevenness in the warptension and the other spring changing the effective stroke of thelet-off pawl when the warp tension exceeds a predetermined resistance ofthe first-mentioned spring.

5. In let-0E mechanism for looms, a warpbeam, a ratchet, a cooperatingpawl, connections between the ratchet and the beam, to rotate the latterand let off the yarn, a rocking whip-roll, and a connection between itand the pawl, said connectionincludingalongitudinally-movable link, afixed abutment through which it passes loosely, two collars adjustablysecured to the link, a spring between the fixed abutment and one of thecollars, to govern the stroke of the pawl when the warp tension becomesexcessive, a second spring interposed between the other of said collarsand an arm rocking with the whip roll, and said arm, the second springtaking up lesser variationsin warp tension and transmitting rockingmovement of the arm to the first-mentioned spring when such movement isabnormal.

6. In let-off mechanism for looms, a warpbeam, a ratchet, a cooperatingpawl, connections between the ratchet and the beam, to rotate the latterand let off the yarn, a pawlcarrier, a whip-roll, a rocking supporttherefor having an attached arm, a link slidably connected with the armand pivoted to the pawl.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WILLIAM HAYNES.

Witnesses:

W. A. OROSLAND, EDWARD L. MEYER.

